Add test for implicitly capturing late-bound var with new capture rules

Author: compiler-errors

tests/ui/impl-trait/implicit-capture-late.rs

@@ -0,0 +1,14 @@
+// known-bug: #117647
+
+#![feature(lifetime_capture_rules_2024)]
+#![feature(rustc_attrs)]
+#![allow(internal_features)]
+#![rustc_variance_of_opaques]
+
+use std::ops::Deref;
+
+fn foo(x: Vec<i32>) -> Box<dyn for<'a> Deref<Target = impl ?Sized>> {
+    Box::new(x)
+}
+
+fn main() {}

tests/ui/impl-trait/implicit-capture-late.stderr

@@ -0,0 +1,9 @@
+error[E0657]: `impl Trait` can only capture lifetimes bound at the fn or impl level
+  --> $DIR/implicit-capture-late.rs:10:36
+   |
+LL | fn foo(x: Vec<i32>) -> Box<dyn for<'a> Deref<Target = impl ?Sized>> {
+   |                                    ^^
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0657`.